44 



Cincinnati Society of Natural History. 



Running over and apparently parasitic upon Diplodia Zeae, 

 Schw. on old cornstalks. One horn of the spore nearly always has 

 one septum less and is, therefore, one segment shorter than the other 

 horn. 



20. Monotospora nigra. — Effused, thin, black; the hyphae 

 long, slender, flexuous, brown, septate, branched, with numerous 

 fertile branches, bearing a single spore at the apex. Sporophore 

 more or less elongated, sometimes very short, ascending or erect ; 

 the spore globose or obovoid, smooth, black, opaque, usually with a 

 short brown pedicel, 14-18 mic. in diameter, the pedicel 4-6 mic. in 

 length. 



Growing on old cornstalks, Preston, Ohio. As in other species 

 there is sometimes on the sphorophore a short lateral branch below 

 the apex bearing another spore. 



21. Acrothecium recurvatum. — Effused in a thin brown 

 stratum. Fertile hyphae long, slender, erect, septate, brown, arising 

 from very fine threads creeping on or within the matrix and scarcely 

 visible, each bearing several spores at the apex in a short helicoid 

 cyme. Spores oblong or oblanceolate, 3 -septate, hyaline, borne on 

 minute blunt teeth of the recurved hyaline rachis, 25-30x7 8 mic. 



Growing on old wood, Preston, Ohio. This differs from all 

 other species of the genus in the peculiar one-sided arrangement of 

 the spores; there are sometimes a dozen or more in the recurved 

 spike. 



22. Streptothrix cinerea. — At first in small white tufts or 

 pulvilli, then at length by confluence becoming extensively effused 

 and changing in color to cinereous. Hyphae greatly elongated, 

 intricately much branched, entangled and matted together; the indi- 

 vidual threads hyaline, spirally twisted and knotted. Spores sessile 

 everywhere upon the hyphae, hyaline, globose, 4-6 mic. in diameter. 



Growing on old cornstalks in autumn; Preston, Ohio,. The 

 threads are as thick as the diameter of the spores, and are twisted 

 in the same characteristic manner as in the common brown species. 



23. Physospora eeegans. — Effused, thin, flocculose, then 

 pulverulent, bright ochraceous; hyphae long, slender, creeping 

 septate, dilute ochraceous, much branched and interwoven, producing 

 everywhere short, erect, inflated vesicles. These vesicles ellipsoid, 

 obovoid or quite irregular, 14-20x9-12 mic. bearing at the apex usually 



